Grinder for sharpening the metallic burrs of grinding-machines



2 Shets-Sheet 1.

(NoModeL) J. & P. JAOOBSEN. GRINDERFOR SHARPENING THE METALLIG BURRS 0F GRINDING MAGHINES.

No. 506,694. Patented Oct. 17, 1893.

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J. 8: P. JAGOBSEN. GRINDER FOR SHARPENING THE METALLIO BURNS 0F GRINDING MACHINES.

-N0. 506,694. I Patented Oct. 17, 1893.

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UNITED STATES PATENT OFFICE.

JAMES JACOBSEN AND PETER JACOBSEN, OF MENASHA, WISCONSIN.

GRINDER FOR SHARPENlNG THE METALLIC BURRS 0F GRINDING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 506,694, dated October 17, 1893.

Application filed March 23, 1893- To all whom it may concern:

Be it known that we, JAMES JAooBsEN and PETER J ACOBSEN, citizens of the United States, residing at Mena'sha, in the county of Winnebago and State of Wisconsin, have invented a new and useful Improvement in Grinders for Sharpening the Metallic Burrs of Grinding-Machines, of which the following is a specification.

Our invention relates to machines for sharpening by grinding, the burrs of feed grinders, or the burrs of grinding machines that may be used for a variety of purposes, such as for grinding grain, bones, paints, barks, &c., and such burrs as are a flat, or approximately flat ring, and that are cast with a chill upon their grinding surfaces, which are so hard as not to be susceptible to the action of a file, and that have become dull, or of an uneven surface by long use, and the object of our invention is, to provide a machine which can be constructed at a small cost and one that is adapted for grinding a true surface upon the face of grinding burrs having a greater or less diameter and thickness, and that is also adapted for grinding grooves in the face of said burr, which grooves are tangents of circles having a different diameter. We attain these objects by means of the device illustrated in the accompanying drawings, in which- I Figure 1 is a side elevation of a grinding machine embodying our invention. Fig. 2 is a top view of said machine. Fig. 3 is a top view of the parts below the line a, a, of' Fig. 1, and Fig. 4:, an end view of the machine as it is seen in looking toward the right of the lines I), b, of Figs. 1 and 2.

Similar figures of reference indicate like parts in the several views.

1 indicates the base of the machine; 2, a cylindrical pillar arranged vertically thereon; 2, nuts and 2'. washers upon the pillar; 3, an arm upon said pillar; 3, a set screw which holds the arm 3 firmly upon the pillar; 3", journal boxes upon one end of said arm; 4, the main driving shaft; 4', 4", and 4", a large pulley,a small one and the driving pol ley respectively,.upon said shaft; 5, 5', grinding wheels of emery, corundum, or of like material; 5", an arbor forcarrying saidwheels; 5", a set collar upon said arbor; 6,.an arm Serial No. 467,384. (No model.)

arranged upon the pillar; 6', a tightener pulley frame pivoted upon the arm 6; 7, a counter shaft journaled in the arm 6 near one end thereof; 7, and 7", large and small pulleys respectively thereon; 8, a crank shaft journaled in the arm 6; 8, a pulley thereon; 9, a crank wheel upon said shaft; 9, a cam upon said crank wheel; 9", a groove in said wheel; 9', a crank pin adjustable in said groove; 10, Ways upon the arm 6; 11, a sliding bed piece; 11', alug depending therefrom; 12, a circular table arranged to revolve upon the bed piece; 13, a feed screw arranged for moving the table and bed piece upon the ways 10; 13, a holder for said screw which is bolted upon the ends of two branches of the arm 6; 14, a pinion for revolving the table 12; 14!, the pinion crank; 14", a bracket in which the pinion shaft is journaled; 15, a grinding burr; 15', bolts for securing said burr upon the table 12; 15", grooves in the faceof the burr; which grooves produce the cutting teeth for grinding; 16, a shaft journaled in the arm 6; 16', an arm extending upward from said shaft; 16", a spring dog arranged upon the arm 16; 16", an arm depend ing from the shaft 16; 17, spring dogs; 17, set screws for securing the dogs 16"and 17; 17", holders for holding the dogs 17; 18, 18, the two parts of a separable connection provided with a slot 18" and bolt 18', by which said parts are connected and can be adjusted lengthwise; 19, a sliding bar arranged for receiving the action of the'cam 9'; 19, keepers in which said bar is arranged to slide; 19", a spring upon said bar for holding the end thereof within the circle of revolution of the cam 9; 20, a connection for connecting the bar 19 and the arm 16".

The grinding machine consists of a base piece 1 upon which is erected the cylindrical pillar 2 and the pillar is provided with two arms, 3 and 6, the upper one of which is attached to the pillar and is secured thereon with the set screw, 3', said arm carrying the main driving shaft 4 and an emery, or other similar kind of grinding wheel, the wheel being revolved by means of a belt from the pulley 4 upon the driving shaft which runs to the pulley 5", upon the outer end of the grinding wheel arbor 5". This arbor is adapted for a longitudinal movement in the journal boxes 3", upon the arm 3, by means of a set collar 5"", between said boxes, for the purpose of adapting the position of the grinding wheel for grinding grooves in difierent grinding burrs, the grooves of which are tangents of circles having a different diameter. The pillar 2 is provided upon the circumference of its lower portion with screw threads and with the nuts 2' and washers 2", for the purpose of adjusting the arm 6 vertically and adapting its position, relative to the arm 3, for grinding wheels of different diameter, and also, for their proper cutting action upon burrs of different thickness.

Upon one end of the arm 6 are arranged ways 10 upon which the bed piece 11, is arranged to slide toward and from the pillar. A crank shaft 8 is journaled in the arm 6, near the pillar and is revolved by means of a belt upon the pulley 8. A counter shaft 7, having a large pulley '7, and a small one 7" is journaled in the arm 6 below the main driving shaft for the purpose of driving said crank shaft at a slow speed, relative to that of the shaft 4, said counter shaft being driven by a small pulley, 4", upon said main shaft. A tightener pulley 6, the frame of which is hinged to the arm 6, is arranged for taking up the .slack of the belt which connects the pulley 4. with the pulley 7, whenever a change is made in the position of the arm 6 which requires it. A crank wheel 9, is secured upon the shaft 8 and is provided with a groove 9", for receiving the crank pin 9", and for its adjustment therein for producing a long or short stroke to said crank. A connection, 18, 18', connects the crank wheel and sliding bed piece 11, whereby the revolution of said crank wheel will produce a reciprocating movement of said bed piece. The connection between the crank wheel and bed piece is in two parts, 18 and 18, and said parts are provided with a slot 18" and bolt 18', by which means the travel of the bed piece can be made at a point upon the arm 6, nearer to, or farther from the pillar.

Upon the bed piece is pivoted a circular table 12, upon which the burrs 1.5, which are to be sharpened are secured with the bolts 15'. The table is provided upon its circumference with teeth which engage with teeth of the pinion l4, and said pinion being supplied with a crank 14', and its shaft journaled in a bracket 14. which is attached to the bed piece 11, said table can have a constant revolution by means of turning said crank. This feature is a necessary one for surface grinding of the grinding burrs, and making the face thereof a true and even surface. Gonnections 18, 18 and 20, are disconnected from the bed piece 11 and arm 16 and a wide faced grinding wheel, 5', as is shown in Fig. 4, is secured upon the arbor 5', when surface grinding is to be performed, the bed piece being moved into the desired position, relative to the grinding wheel, where it can be securedfrom movement upon the ways by means of the bolt and cross bar 11', or in any convenient manner. The position of the grinding wheel relative to the burr, in a direction transversely of the plane of revolution of said wheel, may be changed, either by moving the grinding wheel arbor longitudinally in its bearings and securing it in the desired position by means of the set collar, 5", or by swinging the arm .6 around upon the pillar, whereby the grinding wheel may be brought to act over the entire surface of the burr.

In the operation of surface grinding the belts for driving the counter shaft 7 and crank shaft 8, are disconnected from their pulleys and the arm 6 may be swung around upon the pillar the desired distance for bringing any point of the burr, between its center and circumference, under the grinding wheel.

For grinding the grooves in the faces of the burrs the two arms, 3 and 6, are arranged so that the revolving shafts of one arm are parallel with those of the other. A beveled edge grinding wheel, 5, is secured upon the arbor and the position of the grinding wheel arranged transversely of the arm by moving the arbor longitudinally, as before described. A cam 9, is arranged upon the crank wheel and at each revolution of said wheel moves the sliding bar 19 toward the right, (see Fig. 1,) and by means of the connection 20, which connects with an arm extending from the lower side of said bar and with the arm 16", turns the shaft 16 and thereby throws the arm 16' and spring dog 16", toward the left, said spring dog engaging a groove, 15", in the burr and turning said burr in the direction of the arrow. (See Fig. 2.) A spring, 19", returns the bar and consequently the (log 16", preparatory to the action of said cam at the next revolution of the crank wheel. Suitable belts for driving said crank shaft being applied and the connection 18 being connected with the crank wheel and sliding bed piece, also the connection between the sliding bar 19 and arm 16 being made, the revolution of the crank shaft will produce a reciprocating movement of the bed piece and an intermittent rotary motion of the table 12. The extent of the reciprocating movement can be governed by adjusting the crank pin in the groove 9",and that of theintermittent rotary movement of the grinding burr by adjusting the end of the connection 20, vertically upon the arm 16'. The cam 9', is arranged upon the crank wheel, relative to the crank pin, so that the intermittent rotary movement of the burr occurs at the tirneat which the burr is at the limit of its move-' ment toward the pillar 2, the grinding wheel being then out of'the groove at its inner end. The burr making a reciprocating movement outward from the pillar, the grinding wheel follows a groove and deepens it the depth for which said burr is arranged by the vertical adjustment of the arm 6, and returns in the same groove, when the canal), at the end of IIO said return, actuates the spring dog 16" and rotates the burr to the adjoining groove, pre

paratory to the next reciprocation of the table. For holding the burrs from any return of said rotary movement the spring dogs 17 are provided, which dogs are pointed upon one end and engage the grooves 15 and prevent a return movement of the burr, at the same time serving to hold the burr and table from'an'y liability to move in consequence of any jarring of the machine. The dogs 17 are formed of a round piece of spring mate.-

-rial, adjustably secured by means of a set screw 17', in the upper end of round holders, 17 said holders being adjustably secured in a like manner in the bed piece 11. With this arrangement of said dogs they can be adjusted for burrs of difierent thickness and diameter. The dog 16 is adjustable for burrs of diiferent thickness and diameter by moving it longitudinally and turning it around in the arm, where it may be secured with the set screw, 17

For the purpose of providing a machine for doing a limited amount'of work and one that can be constructed at less cost than the one here described, we dispense with the counter shaft 7, its pulley and the pulley upon the main shaft for driving it," the crank shaft 8, pulley 8', crank wheel 9, sliding bar 19, its keeper 19', spring 19", connections 18, 18' and 20, shaft 16, arms 16 and 16', spring dog 16'', and substitute therefor the feed screw 13. This screw is provided with a crank and is arranged to turn loosely in the holder 13, which is bolted to the ends of the arm 6. The bed piece 11 is provided with a depending lug, 11, which is screw threaded and receives the screw 13. By turning said screw the bed piece can be moved toward and from the pillar for the purpose of grinding the grooves in the burrs, the turning of the burr from one groove to another being performed by turning the crank of the pinion 14. The machine is thereby adapted for doing the same work as the one with the automatic movement of the bed piece and revolving table, but at'a decreased rate of speed. After the burrs have been trued upon their face and have the grooves thereof re-cut they will be in as good, or a better condition for grinding than when new from the mold. The power required to do the grinding for which they may be used will be greatly reduced from the amount necessary when the burrs are dull and of an uneven face, and the quality and quantity of the product cf the burrs will be greatly improved. A further saving can be effected by the difference in cost in favor of sharpening theburrs, from the cost of replacing them with new ones.

Having described our invention, What we claim, and desire to secure by Letters Patent, 1s

1. A grinding burr sharpening device consisting of a base having a cylindrical pillar arranged vertically thereon, an arm having means for its vertical adjustment upon'said pillar, a bed piece arrangedfor a reciprocat-, ing movement upon said arm and havinga revolving table thereon adapted to receivea grinding burr, said table being provided with mechanismfor giving it an intermittent rotary motion at each return movement of the aforesaid reciprocating movement of the bed piece, dogs for holding the burrfrom turning backward during said intermittent rotary movement, a grinding wheel arranged for revolution above said table. for grinding grooves in the face of said grinding burr, said; grinding wheel being adjustable in the direction of its axial line for adapting its position for burrs having grooves which are tangents of circles having a different diameter, substantially as set forth.

2. A grinding burr sharpening device, consisting of a base having a cylindrical pillar arranged vertically thereon, an arm upon the pillar having a grinding wheel journaled near one end thereof, said grinding wheel being adjustable in the direction of its axial line for adapting its position for burrs having grooves that are tangents of circles having a difier-- ent diameter, an arm arranged under said grinding wheel, a bed piece upon said lower arm, a crank wheel arranged for giving to the bed piece a reciprocating movement upon the arm, a revolving table upon said bed piece adapted to receive a grinding burr, a ratchet,

or dog, arranged for engaging grooves in a grinding burr upon said table, a cam upon said crank wheel adapted to actuate saidratchet, or dog, and to turn the grinding burr from one groove to another at each return of said reciprocating movement of thebed piece, and dogs for holding said burr from turning backwardduringsaidintermittentmovement, all combined and operating substantially as described.

3. A grinding burr sharpening device, consisting of a base piece having a cylindrical pillar arranged vertically thereon, an arm upon said pillar havinga grinding wheel journaled near one end thereof, said grinding wheel being adjustable in the direction of its axial line for adapting its position for burrs having grooves which are tangents of circles having a different diameter, an arm arranged under said grinding wheel, said arm being. arranged for both a vertical adjustment and a rotary movement upon said pillar, a bed piece upon said arm arranged for a radial movement toward and from the pillar and for holding the bed piece at any point of said movement, a table revoluble upon said bed piece and being adapted to receive a, grinding burr, means for revolving said table, and

thereby presenting the surface of the burr thereon to the cutting action of the grinding consisting of a base piece, a cylindrical pillar arranged vertically thereon, an arm upon said pillar having a grinding wheel journaled near one end thereof, said grinding wheel being adjustable in the direction of its axial line for adapting its position for burrs having grooves which are tangents of circles having a different diameter, an arm arranged under said grinding wheel, said arm being arranged for both a vertical adjustment and a rotary movement upon said pillar, a bed piece upon said lower arm, a crank wheel arranged for giving said bed piece a reciproeating movement upon the arm, means for holding the bed piece at any point of said movement, a table having means for its constant revolution upon the bed piece and being 

